Thought I'd post this in case anyone might be interested. No, I'm not affiliated with the seller.
https://www.goldmine-elec-products.com/prodinfo.asp?number=G26561B&utm_source=Goldmine&utm_campaign=e5c0b76510-MAY23-2014_COPY_01&utm_medium=email&utm_term=0_15cb8e0368-e5c0b76510-60060910 (https://www.goldmine-elec-products.com/prodinfo.asp?number=G26561B&utm_source=Goldmine&utm_campaign=e5c0b76510-MAY23-2014_COPY_01&utm_medium=email&utm_term=0_15cb8e0368-e5c0b76510-60060910)
Datasheet:
http://cdn.goldmine-elec.com/datasheet/G26561.pdf (http://cdn.goldmine-elec.com/datasheet/G26561.pdf)
I had assumed these chips were MOS, but no, reading the datasheet they are bipolar. Service sheets usually include pinout drawings so I never looked further. Yet these chips do spontaneously fail, just as the early MOS devices did.